I can only give a rough idea, because it also depends on the type of virus.

1, computer anomalies, such as black screen, blue screen, crash, file can't be opened, and so on.

2. Take up resources. Unknown file takes up space, etc.

3. The computer is slow and stuck.

4. The account number is lost. Viruses or Trojans are malicious programs that invade computers and wait for opportunities to steal account passwords. They are a kind of computer virus. Usually, the Trojan horse will run automatically. In the process of surfing the internet, if you log in to online banking, chat account, etc. Your personal security information will be stolen, resulting in the theft of user accounts and property losses.

Under normal circumstances, the light will often pop up some web pages, slowing down the network speed; A little heavier will modify your registry, so that the file can not be used normally; What's more, it may even cause your hard disk to be formatted and the machine to be paralyzed.

Protect your computer at ordinary times and give some advice.

1, still need to install anti-virus software. It is necessary to update the virus database in time and install a firewall (to prevent Trojan horses and hacker attacks, etc.). ) regular anti-virus to maintain the safety of computer operation;

It is suggested that the landlord can install Tencent computer housekeeper, which integrates free professional security software and anti-virus management (only need to download one copy), occupying less memory, good anti-virus, good protection and no error killing. We have embedded anti-virus engines in world-class anti-virus software such as cloud anti-virus engine, anti-virus engine, Jinshan cloud anti-virus engine, AVIRA anti-virus engine, Red Umbrella and anti-virus repair engine!

2. Fix vulnerabilities and patches;

3. Don't go to some unknown websites at ordinary times, and don't download things casually;

4. Beware of portable storage devices (such as USB flash drives). Recently, the U disk virus is quite rampant);

5. Do not enter unknown websites or receive strange emails. After downloading the compressed package file, scan the virus first.

6. Close unnecessary ports.

7. If you have time and energy, learn some common computer skills and knowledge;

Finally, I want to say that if you are really careful at ordinary times, but you are still poisoned, there is nothing you can do! (It is a good choice to back up the system with Ghost)